Low-temperature, Selective Catalytic Deoxygenation of Vegetable Oil in Supercritical Fluid Media

The effects of supercritical fluids on the production of renewable diesel‐range hydrocarbons from natural triglycerides were investigated. Various supercritical fluids, which included CO2 (scCO2), propane (scC3H8) and n‐hexane (scC6H14), were introduced with H2 and soybean oil into a fixed‐bed react...

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Veröffentlicht in:ChemSusChem 2014-02, Vol.7 (2), p.492-500
Hauptverfasser: Kim, Seok Ki, Lee, Hong-shik, Hong, Moon Hyun, Lim, Jong Sung, Kim, Jaehoon
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creator Kim, Seok Ki
Lee, Hong-shik
Hong, Moon Hyun
Lim, Jong Sung
Kim, Jaehoon
description The effects of supercritical fluids on the production of renewable diesel‐range hydrocarbons from natural triglycerides were investigated. Various supercritical fluids, which included CO2 (scCO2), propane (scC3H8) and n‐hexane (scC6H14), were introduced with H2 and soybean oil into a fixed‐bed reactor that contained pre‐activated CoMo/γ‐Al2O3. Among these supercritical fluids, scC3H8 and scC6H14 efficiently allowed the reduction of the reaction temperature by as much as 50 °C as a result of facilitated heat and mass transfer and afforded similar yields to reactions in the absence of supercritical fluids. The compositional analyses of the gas and liquid products indicated that the addition of scC3H8 during the hydrotreatment of soybean oil promoted specific deoxygenation pathways, decarbonylation and decarboxylation, which consumed less H2 than the hydrodeoxygenation pathway. As a result, the quantity of H2 required to obtain a high yield of diesel‐range hydrocarbons could be reduced to 57 % if scC3H8 was used. As decarboxylation and decarbonylation are mildly endothermic reactions, the reduced heat transfer resistance in scC3H8 may drive the deoxygenation reaction to thermodynamically favourable pathways. Lower temperature and less H2: The catalytic conversion of natural triglycerides into diesel‐range hydrocarbons is effectively demonstrated by using supercritical fluids as reaction media, which enables a decrease in reaction temperature and selectively promotes the decarboxylation pathway that consumes less H2.
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Various supercritical fluids, which included CO2 (scCO2), propane (scC3H8) and n‐hexane (scC6H14), were introduced with H2 and soybean oil into a fixed‐bed reactor that contained pre‐activated CoMo/γ‐Al2O3. Among these supercritical fluids, scC3H8 and scC6H14 efficiently allowed the reduction of the reaction temperature by as much as 50 °C as a result of facilitated heat and mass transfer and afforded similar yields to reactions in the absence of supercritical fluids. The compositional analyses of the gas and liquid products indicated that the addition of scC3H8 during the hydrotreatment of soybean oil promoted specific deoxygenation pathways, decarbonylation and decarboxylation, which consumed less H2 than the hydrodeoxygenation pathway. As a result, the quantity of H2 required to obtain a high yield of diesel‐range hydrocarbons could be reduced to 57 % if scC3H8 was used. As decarboxylation and decarbonylation are mildly endothermic reactions, the reduced heat transfer resistance in scC3H8 may drive the deoxygenation reaction to thermodynamically favourable pathways. 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As decarboxylation and decarbonylation are mildly endothermic reactions, the reduced heat transfer resistance in scC3H8 may drive the deoxygenation reaction to thermodynamically favourable pathways. 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subjects biomass
Catalysis
fatty acids
hydrocarbons
hydrogen
Hydrogen - chemistry
Oxygen - chemistry
Phase Transition
Plant Oils - chemistry
Solvents - chemistry
supercritical fluids
Temperature
title Low-temperature, Selective Catalytic Deoxygenation of Vegetable Oil in Supercritical Fluid Media
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